Ok so your RpcSs ImagePath is actually ok. The difference between the 2 is the addition of the file extension (.exe) to the svhost. The original ImagePath value doesn't have this which I believe is why RKill reports it incorrectly. You can remove this manually via regedit if you wish, leave it alone, or use the atached reg file to change it.
example:
your current ImagePath Value is:
%SystemRoot%\system32\svchost.exe -k rpcss
The original Value is:
%SystemRoot%\system32\svchost -k rpcss
Either value will work just fine.
What type of internet connection are you using? Wireless, Ethernet etc?
Are you using a Proxy or VPN?
Some things to try:
If you have more than one antivirus uninstall all but one.
Turn off any antivirus real time protection.
Turn off your firewall (again you should only have 1)
Try booting into safe mode with networking.
reset router/modem.
Using another PC download your network adapter drivers from your PC manufacturer and transfer to pc.
Uninstall your network adpater drivers (check the box to delete driver) then reboot and install the one you downloaded ealier.
Please report your findings.
You may also try resting your TCP/IP settings:
http://support.microsoft.com/kb/299357And your winsock/LSP:
http://www.cexx.org/lspfix.htmNOTE: Any programs that use alternate winsock settings will need to be reinstalled after doing these fixes!